mnemo_cards/mnemo_cards_backend/lib/discounts/discount_drift_extension.dart

import 'package:drift/drift.dart' as drift;
import 'package:drift_postgres/drift_postgres.dart';
import 'package:mnemo_cards_backend/database/daos/discount_dao.dart';
import 'package:mnemo_cards_backend/database/database.dart';
import 'package:mnemo_cards_common/mnemo_cards_common.dart';
import 'package:mnemo_cards_common_backend/mnemo_cards_common_backend.dart';

/// Extension для конвертации DiscountCampaign (Drift) в DTO
extension DiscountCampaignToDto on DiscountCampaign {
  Future<DiscountCampaignDto> toDto(DiscountDao discountDao) async {
    final discounts = await discountDao.getDiscountsByCampaignId(id);
    final discountsDto = discounts.map((d) => d.toDto()).toList();

    DiscountCampaignStatus statusEnum;
    switch (status) {
      case 'created':
        statusEnum = DiscountCampaignStatus.created;
        break;
      case 'active':
        statusEnum = DiscountCampaignStatus.active;
        break;
      case 'expired':
        statusEnum = DiscountCampaignStatus.expired;
        break;
      case 'disabled':
        statusEnum = DiscountCampaignStatus.disabled;
        break;
      default:
        statusEnum = DiscountCampaignStatus.created;
    }

    return DiscountCampaignDto(
      id: id,
      start: start.dateTime,
      finish: finish.dateTime,
      status: statusEnum,
      name: name,
      tags: tags,
      discounts: discountsDto,
    );
  }
}

/// Extension для конвертации Discount (Drift) в DTO
extension DiscountToDto on Discount {
  DiscountDto toDto() {
    final productsList = (products ?? [])
        .map((p) {
          if (p is Map<String, dynamic>) {
            return MnemoCardsProductDto.fromJson(p);
          }
          return null;
        })
        .whereType<MnemoCardsProductDto>()
        .toList();

    return DiscountDto(
      discountPercent: discountPercent,
      products: productsList,
      id: id.toString(),
    );
  }
}

/// Extension для конвертации DiscountCampaignDto в DiscountCampaignsCompanion
extension DiscountCampaignDtoToCompanion on DiscountCampaignDto {
  DiscountCampaignsCompanion toCompanion() {
    String statusStr;
    switch (status) {
      case DiscountCampaignStatus.created:
        statusStr = 'created';
        break;
      case DiscountCampaignStatus.active:
        statusStr = 'active';
        break;
      case DiscountCampaignStatus.expired:
        statusStr = 'expired';
        break;
      case DiscountCampaignStatus.disabled:
        statusStr = 'disabled';
        break;
    }

    return DiscountCampaignsCompanion.insert(
      id: id != null ? drift.Value(id!) : const drift.Value.absent(),
      name: drift.Value(name),
      start: PgDateTime(start),
      finish: PgDateTime(finish),
      status: statusStr,
      tags: drift.Value(tags),
    );
  }
}

/// Extension для конвертации DiscountDto в DiscountsCompanion
extension DiscountDtoToCompanion on DiscountDto {
  DiscountsCompanion toCompanion(String campaignId) {
    final productsJson = products.map((p) => p.toJson()).toList();

    return DiscountsCompanion.insert(
      campaignId: campaignId,
      discountPercent: discountPercent,
      products: drift.Value(productsJson),
    );
  }
}

/// Helper для конвертации статуса в строку
String discountCampaignStatusToString(DiscountCampaignModelStatus status) {
  switch (status) {
    case DiscountCampaignModelStatus.created:
      return 'created';
    case DiscountCampaignModelStatus.active:
      return 'active';
    case DiscountCampaignModelStatus.expired:
      return 'expired';
    case DiscountCampaignModelStatus.disabled:
      return 'disabled';
  }
}

/// Helper для конвертации строки в статус
DiscountCampaignModelStatus? discountCampaignStatusFromString(String? status) {
  if (status == null) return null;
  switch (status) {
    case 'created':
      return DiscountCampaignModelStatus.created;
    case 'active':
      return DiscountCampaignModelStatus.active;
    case 'expired':
      return DiscountCampaignModelStatus.expired;
    case 'disabled':
      return DiscountCampaignModelStatus.disabled;
    default:
      return null;
  }
}